I answered 7 questions as best I could. Along the way, I selected links to provide more information. There are other questions, which I can not answer or only partially answer.
How will the Ukrainian war end?
Military experts are surprised how well Ukraine has done, in spite of being vastly outnumbered by Russia. I don’t know how this will end. The position of the US is the outcome is up to negotiations between Russia and Ukraine.
Why did Putin invade on February 24, 2022?
The invasion was unprovoked. On 21 February 2022, Russia recognised the Donetsk People’s Republic and the Luhansk People’s Republic, two self-proclaimed statelets in Donbas controlled by pro-Russian separatists. (Wikipedia)
Prior to the invasion, Russia began a joint military exercise with Belarus, beginning on February 10, 2022. The large-scale military exercise will last until Feb. 20. Russia’s Defense Ministry said the joint operation in Belarus, which includes warplanes, missile launchers and live-fire exercises, will focus on “suppressing and repelling external aggression during a defensive operation.” Approximately 30,000 Russian troops participated in this exercise. The US and NATO considered this exercise was an excuse for preparations for an invasion. President Joe Biden observed that the Russians had set up a large military hospital on the border of Ukraine, as proof that Russia was getting set up for an invasion. Russian warships were sent out to the Black Sea.
This does not answer the question of why on February 24, Putin made the fateful decision to invade. Many observers felt Putin had badly misjudged the response of the Ukrainians and their allies. Putin has justified the invasion, as necessary to protect Russian lives in the Donbas region, but both the US and NATO conclude that Russia was supporting the separatists in the regions with military equipment.
What events radicalize Putin thinking, to the point where he felt military action was necessary?
Many experts have given opinions on the events which embolden Putin to invade Ukraine. Some have pointed out the successes Putin had achieved through the use of Russia’s military in both Syria and Chechnya. Other experts have stated that Putin became more radicalized after the US invasion of Iraq in March 20, 2003.
I believe NATO’s involvement in supporting the no-fly zone in Libya during their civil war in 2011, increased Putin’s anger towards NATO and the US. In support of the no-fly zone, NATO forces bombed numerous military installations including Qadaffi’s compound in Tripoli. This was part of “Arab Spring” rebellion which lead to protests in many countries including Russia. I believe this is one reason why Russia attempted in interfere with the presidential elections in 2016.
Putin considers NATO has far gone beyond the initial objective of collective defense of Western Europe and is a threat to countries outside of NATO including Russia. He also considers NATO is simply a tool of the US.
Ukraine was first attacked in 2014, by the takeover and annexation of the Crimean peninsula. It was done quickly and without bloodshed. His popularity in Russia increased. So, attacking Ukraine is presented to the Russian people today, as simply taking back what always belonged to Russia (or the Soviet Union).
Is Putin married? Does he have children? Does he ever smile? Is he wealthy?
Putin married in 1983 and was divorced in 2014. The marriage produced two daughters. Wikipedia states “An investigation by Proekt published in November 2020 alleged that Putin has another daughter, Elizaveta, also known as Luiza Rozova, (born March 2003), with Svetlana Krivonogikh.” It has been widely reported that Putin has a serious relationship with Alina Kabaeva, Alina Maratovna Kabaeva or Kabayeva is a Russian politician, media manager, retired individual rhythmic gymnast, and Honoured Master of Sports. Kabaeva is one of the most decorated gymnasts in rhythmic gymnastic history, with 2 Olympic medals, 14 World Championship medals, and 21 European Championship medals. (Wikipedia)
A smiling Putin is very rare.
Putin is likely a multi-billionaire with many residences and other possessions in Russia. He denies this.
See link: Wikipedia Vladimir Putin